[improvement] Update supported version of Go

[d-kuro]

Using Go Modules with Go version 1.11.3 lower fails to resolve dependency.
Related to this issue: golang/go#27093

$ go version
go version go1.11.3 darwin/amd64

$ go clean -modcache

$ GO111MODULE=on go install
go: finding github.com/davecgh/go-spew v1.1.1
go: finding github.com/mitchellh/go-homedir v1.0.0
go: finding github.com/mattn/go-runewidth v0.0.4
go: finding github.com/sirupsen/logrus v1.3.0
go: finding github.com/nsf/termbox-go v0.0.0-20190104133558-0938b5187e61
go: finding github.com/skanehira/gocui-component v0.0.0-20190103120946-5f5ba7f77c3b
go: finding github.com/jroimartin/gocui v0.4.0
go: finding github.com/fsouza/go-dockerclient v1.3.3
go: finding golang.org/x/crypto v0.0.0-20190103213133-ff983b9c42bc
go: finding golang.org/x/crypto v0.0.0-20180904163835-0709b304e793
go: finding github.com/stretchr/objx v0.1.1
go: finding github.com/pmezard/go-difflib v1.0.0
go: finding github.com/stretchr/testify v1.2.2
go: finding github.com/konsorten/go-windows-terminal-sequences v1.0.1
go: finding golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33
go: finding github.com/gorilla/mux v1.6.2
go: finding github.com/pkg/errors v0.8.1
go: finding golang.org/x/sys v0.0.0-20190102155601-82a175fd1598
go: finding github.com/opencontainers/go-digest v1.0.0-rc1
go: finding gotest.tools v2.2.0+incompatible
go: finding github.com/docker/go-units v0.3.3
go: finding github.com/gorilla/context v1.1.1
go: finding github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78
go: finding github.com/containerd/continuity v0.0.0-20181203112020-004b46473808
go: finding github.com/vishvananda/netlink v1.0.0
go: finding github.com/docker/libnetwork v0.8.0-dev.2.0.20180608203834-19279f049241
go: finding github.com/Microsoft/go-winio v0.4.11
go: finding github.com/opencontainers/runc v0.1.1
go: finding github.com/Nvveen/Gotty v0.0.0-20120604004816-cd527374f1e5
go: finding github.com/gogo/protobuf v1.2.0
go: finding github.com/vishvananda/netns v0.0.0-20180720170159-13995c7128cc
go: finding github.com/docker/docker v0.7.3-0.20180827131323-0c5f8d2b9b23
go: finding github.com/google/go-cmp v0.2.0
go: finding github.com/docker/go-connections v0.4.0
go: finding github.com/opencontainers/image-spec v1.0.1
go: downloading github.com/jroimartin/gocui v0.4.0
go: downloading github.com/fsouza/go-dockerclient v1.3.3
go: downloading github.com/skanehira/gocui-component v0.0.0-20190103120946-5f5ba7f77c3b
go: downloading golang.org/x/crypto v0.0.0-20190103213133-ff983b9c42bc
go: downloading github.com/davecgh/go-spew v1.1.1
go: downloading github.com/sirupsen/logrus v1.3.0
go: downloading github.com/mitchellh/go-homedir v1.0.0
go: downloading github.com/nsf/termbox-go v0.0.0-20190104133558-0938b5187e61
go: downloading github.com/mattn/go-runewidth v0.0.4
go: downloading github.com/docker/docker v0.7.3-0.20180827131323-0c5f8d2b9b23
go: downloading github.com/Nvveen/Gotty v0.0.0-20120604004816-cd527374f1e5
go: downloading golang.org/x/sys v0.0.0-20190102155601-82a175fd1598
go: downloading github.com/docker/go-units v0.3.3
go: verifying github.com/docker/docker@v0.7.3-0.20180827131323-0c5f8d2b9b23: checksum mismatch
	downloaded: h1:Zl/9mUfPbYbnv895OXx9WfxPjwqSZHohuZzVcjJ5QPQ=
	go.sum:     h1:mJtkfC9RUrUWHMk0cFDNhVoc9U3k2FRAzEZ+5pqSIHo=

[d-kuro]

done: #61